This is a tough one to answer with a single answer.... because I think a big part of your question will be determined on the goals YOU have for YOUR tank. I don't think it's so much as "You should use this vs. that"... as personal goals, what maintenance obligations you want to take on vs. what you want automated, and finally troubleshooting issues as they arise. It's one of those things where you sit there and say.... " Well, my tank is doing this... let me see what other's have done when their tank does this, and see which option sounds like something I could try..."
Best advice would be to start browsing member tank threads and see which tanks appeal to you most, in design and what corals and fish they are keeping, how much success they've had... etc. Then use those to develop a method or system that you could emulate on your own.
And when you run into the very specific decisions and you have questions or aren't sure... you will be able to do much more pointed research on that particular component of your tank. And ask questions
I generally try to keep things simple with my tanks, and go by "less is more". Nice big skimmer, fuge with a little live rock and chaeto, manual 2-part dosing, and regular weekly water changes (labor intensive, but I'm a control freak and don't trust automation as much) But, you will need to decide which style best suits your routine and tank goals long term.
It's a very multi-faceted hobby... and certainly more than one way to have a beautiful mixed reef. I wish you the best of luck!